« previous next »
« previous next »
 

Did you know?

The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Did you know?

The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Sieve-tube elements and companion cells in phloem tissue Sieve-tube elements and companion cells in phloem tissue
scanning electron micrograph showing an ovum (pink) released by the ovary at ovulation surrounded by scanning electron micrograph showing an ovum (pink) released by the ovary at ovulation surrounded by
Types of muscle tissue. Types of muscle tissue.
TISSUE CULTURE TISSUE CULTURE
Herbert Spencer (1820–1903), sometimes called the second founder of sociology, coined the term ... Herbert Spencer (1820–1903), sometimes called the second founder of sociology, coined the term ...
Colon with diverticulosis. An inflamed or infected diverticulum is called diverticulitis. Colon with diverticulosis. An inflamed or infected diverticulum is called diverticulitis.
Video: Mycobacterium tuberculosis: Drug Resistance and Natural Selection

For a complete list of videos, visit our video library